Abstract MP layer

diff --git a/sbin/isakmpd/math_mp.h b/sbin/isakmpd/math_mp.h
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+/*     $OpenBSD: math_mp.h,v 1.1 2000/04/07 21:44:16 niklas Exp $      */
+/*     $EOM: math_mp.h,v 1.1 2000/04/07 19:38:16 niklas Exp $  */
+
+/*
+ * Copyright (c) 1999 Niklas Hallqvist.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by Ericsson Radio Systems.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * This code was written under funding by Ericsson Radio Systems.
+ */
+
+#ifndef _MATH_MP_H_
+#define _MATH_MP_H_
+
+#define MP_FLAVOUR_GMP         1
+#define MP_FLAVOUR_OPENSSL     2
+
+#if MP_FLAVOUR == MP_FLAVOUR_GMP
+
+#include <gmp.h>
+
+#define mpz_t math_mp_t;
+
+#elif MP_FLAVOUR == MP_FLAVOUR_OPENSSL
+
+#include <ssl/bn.h>
+
+typedef BIGNUM *math_mp_t;
+
+#else
+
+#error "No multiprecision math library chosen."
+
+#endif
+
+#endif /* _MATH_MP_H_ */